HTML & JavaScript
<html>
<head><title>Assignment_19iii(Regular Expression)</title>
<script type='text/javascript'>
function isAlphabet(elem, helperMsg){
var alphaExp = /^[a-zA-Z]+$/;
if(elem.value.match(alphaExp)){
return true;
}else{
alert(helperMsg);
elem.focus();
return false;
}
}
</script>
</head>
<body>
<form>
Letters Only: <input type='text' id='letters'/>
<input type='button'
onclick="isAlphabet(document.getElementById('letters'), 'Letters Only Please')"
value='Check Field' />
</form>
</body>
</html>
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